Suggest another PTC fuse with better characteristics
Hi guys,
I'm using the following PTC fuse to protect the Tiny Scarab board (and the PC you're plugging it in):
9 Replies
The part number is
0402L050SLIt's a PTC resettable fuse that can hold 500 mA. As per the USB standard, that should be fine. The PC should be able to deliver 500 mA on each USB port without damaging itself.
However, I'm a bit worried about two things:
1) The
0402L050SL will trip only at 1A. In other words, the trip current is twice as high as the hold current. Isn't that a bit dangerous for the PC?
2) The 0402L050SL has a R_min of 0.040 Ohm. That looks okay. However, the R1_max is 0.400 Ohm. The datasheet says: R 1max = Maximum resistance of device at 20°C measured one hour after tripping or reflow soldering of 260°C for 20 sec. Could this be a problem?PS: please feel free to suggest another PTC fuse with better characteristics
Poly switches are not completely reliable devices. If you need it to trip in between 500-1A.
Else for generic purposes these are apt.
Can you share the end application? @Petr Dvořák can add insightd
@kmulier Would it be possible to start a separate room/chat for the Scarab board? Here in the dev-chat there is a mess. I almost don't read the messages here. To your question. I recommend considering the 0402L020SL or even 010SL. I recommend to consider the average power consumption of the board and make a decision based on that value.